Clamping appliance for frames with glued mitered joints.



Patented Sept. 26, 1899.

B. MLLER. CLAMPING APPLIANCE FR FRAMES WITH GLU-ED MITERED JUINTS.

(Application led Hay 19, 1898.)

Hin Model.)

2 S'heets--Sheet I,

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Patented Sept.y 26, |899.

B.- MLLER'.. y CLAMPING APPLIANCE FUR FRAESWITH lGLiUED MITERED JUINTS.

(Application filed 19j 189801' 2 Sheets-Sheet 2.

(No Model.)

NTTnn STATES PATENT Trice.

EARTHEL MLLER, OF COBLENZ, GERMANY.

CLAMPING APPLIANCE FOR FRAMES WITH GLUED MITERED JOINTS.

SPECIFICATION forming part of Letters Patent No. 633,657, dated September 26, 1899.

Application ilecl May 19, 1898. Serial No. 681,161. (No model.)

To @ZZ whom, zr 71mg/ concern:

Be it known that l, BARTHEL MLLER., a sub'- ject of the King of Prussia, Emperor of Germany, residing at Coblenz, in the Kingdom of Prussia and German Empire, have invented certain new and useful Improvements in Clamping Appliances for Frames with Glued Mitered Iloints, (for which I have applied for patents in Austria, dated April 18, 1898, and in England, dated April 18, 1898, No. 9,000,) of which the following is a specification.

This invention relates to a clamping device for use in the manufacture of picture and otherframes having glued miter-joints,where by on the fitting together of the glue-coated miter edges of the parts ofthe frame these are pressed together with a uniform and strong pressure by the mere turning of a tighteninglever.

l will describe the said invention with reference to the accompanying drawings, in which- Figure l shows the complete apparatus as applied to a rectangular frame. Figs. 2 and 3 show a front view and section of one of the angle-pieces on an enlarged scale, and Figs. 4: and 5 show a front view and end view of an angle-piece with the tightening device applied thereto.

As shown in Fig. l, the clamping device consists of four rectangular angle-pieces A B C D, which are connected together by a cord 7c. As shown in Figs. 2 and 3, the anglepieces consist of an accurately rectangular shaped piece of wood a, strengthened by an iron plate b, which forms a groove e in combination with the notched outer edge of the wood piece. rThrough this groove is passed a cord 7o, which can slide therein and passes at the corner over a guide-pulley f, being pre vented by pins d from falling out. The main feature of the clamping device consists of the tightening mechanism applied to the angle piece D, as shown at Figs. 4 and 5. This angle-piece D differs from the others in that instead ot' having a single iron cheek b it has two such, b' b', between which is formed a wide groove d, that serves to receive the tightening-lever h, pivoted on a pin t'.

Vhen the clamping device has been fitted upon a frame, as shown by way of example in Fig. l, the angle-piece D with the tightening device will be situated at the upper righthand corner. The cord 7c has its one end 7e', which is tied into a knot, secured to the lever 7L by being passed through a hole m therein, and passes thence first over the grooved and circularly-curved end 'Lo of the lever and then over the roller r downward and successivel y over the grooves and rollers of the angle-pieces A B C and under the pin n. of piece d, and finally back again to the lever end it'. Here the part k2 is passed in the contrary direction to its commencement 7s around the lever end w and through the hole p of the lever h, and after being twisted around the projecting screw or stud s it is finally passed under the loop q of the spring-hook o, attached at to the piece D, the free end 7a2 of the cord being allowed to hang down, as shown.

This clamping appliance is used as follows: The parts of the frame cut with miter ends after having their miter-surfaces coated with glue are tted together and have the separate angle-pieces A B C D applied to the corners. The tightening-lever h is then turned up, so as to be about parallel with the miter, to an angle of about forty-five degrees. The end k2 of the cord. is then drawn tight by hand and secured tightly around the screws. The 1e ver h is then turned downward, whereby the two parts 7c' and 7a2 of the cord 71; will be wound up around the pulley-shaped end LU of the lever h, and thus exert a strong pull upon the part of the cord extending around the anglepieces A B C D, which are in consequence pressed with considerable force and great uniformity against the outer surfaces of the frame-corners, by which means any distortion of the frame is effectually avoided.

By means of the hook o, which can be conveniently attached by a screw to the lower end of the angle-piece D, as shown, the lever h is prevented from turning back out of the tightening position, so that the frame can be secured under pressure for any length of time by the said clamping device. The loop q of the spring-hook 0 at the same time serves, as above described, to nip the end k2 of the cord against the lever h, and thus prevent any loosening thereof.

By means of the above-described clamping device, therefore, it renders possible to IOO draw together the freshly-glued parts of a frame in such lnanner that all the eight glued surfaces are pressed together in a perfectly uniform manner without the possibility of the frame being in any Way damaged, which was practically unavoidable with the usual appliance for this purpose.

The appliance operates rapidly, reliably, and convenientlyand can be applied to frames of any size.

Although by Way of example I have shown vthe invention as applied to a rectangular frame, it will be obvious that it is equally applicable to any frames composed of three, four, or more parts joined together by glued miter edges, the shape of the angle-pieces being varied accordingly.

What I claim, and desire to secure by Letters Patent of the United States, is-

l. An appliance for tightening the sections of frames, consisting of a series of anglepieces, adapted to be applied to the corners of the frames, the said angle-pieces having grooved outer edges, a lever pivoted near one end in the groove of one of said angle-pieces, a cord having one end attached to the lever, the said cord passing over the fulcrumed end of the lever and over pulleys located in the grooves of the several angle-pieces, the other end of said cord passing over the fulcrumed end of the lever in a reverse direction and a locking device adapted to connect the lever and the angle-piece to hold the lever in the tightening position, the said locking device also serving to hold the end of the cord, substantially as described.

2. The combination of an angle-piece having a grooved outer edge, a lever pivoted near one end in said groove, a cord having one end extending through a hole in the lever and fastened thereto, the said cord passing over the fulcrulned end of the lever, the other end 3. The combination of an angle-piece, having metal side pieces with a groove between the side pieces, a pulley located in the groove near one end of said angle-piece, a pin located near the outer angle of said piece, a lever fulcrunied near one end on said pin, a cord having one end attached to the lever, the said cord passing over the fulcrumed end of the lever, a screw or stud projecting from the side of the lever and around which the other end of said cord is passed, and a locking device comprising a spring-hook attached to one end of the angle-piece and adapted to engage au opening in the lever, to hold the same in position, the said springhook also serving to hold the end of the cord, substantially as described.

4. The combination of a series of anglepieces, a lever mounted on one of said pieces, a cord connected with the lever and rove over said pieces, and a locking device adapted to connect the angle-piece and lever, to hold the lever in the tightening position, the said locking device also serving to hold the end of the cord, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two Witnesses.

BARTHEL MULLER.

Vitnesses:

WILLIAM H. MADDEN, GERTRUD STENZ. 

